WebThe #define preprocessor directive creates symbolic constants. The symbolic constant is called a macro and the general form of the directive is −. #define macro-name replacement-text When this line appears in a file, all subsequent occurrences of macro in that file will be replaced by replacement-text before the program is compiled. For ... WebDec 3, 2024 · Token-pasting operator (##) Allows tokens used as actual arguments to be concatenated to form other tokens. It is often useful to merge two tokens into one while expanding macros. This is called token pasting or token concatenation. The ‘##’ pre-processing operator performs token pasting. When a macro is expanded, the two tokens …
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WebMacros are categorized into two main groups: object-like macros and function-like macros. Macros are treated as a token substitution early in the compilation process. This means … WebA macro can be declared to accept a variable number of arguments much as a function can. The syntax for defining the macro is similar to that of a function. Here is an example: #define eprintf (...) fprintf (stderr, __VA_ARGS__) This kind of macro is called variadic. svabhavakripana
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WebA macro is defined as the piece of code that is replaced by the value of the macro in the program. We can define the macro by using the #define directive. Whenever a compiler encounters the macro name, it replaces it with the definition of the macro. There is no need to terminate the macro definition using a semi-colon (; ). WebThe C preprocessor, often known as cpp, is a macro processor that is used automatically by the C compiler to transform your program before compilation. It is called a macro processor because it allows you to define macros, … WebApr 10, 2024 · #define: This directive is used to define a macro, which is a name that represents a piece of code or a constant value. Macros are expanded by the preprocessor during preprocessing. c. #ifdef, #ifndef, #if, #else, #elif, and #endif: These directives are used for conditional compilation. They allow the preprocessor to include or exclude … bart4k